It is also noted that the timestamp of the subtitle is incorrect.
Example the first valid subtitle extracted is at 00:09:57.807

But it actually happens at 00:05:52.500 in the movie (by manually playing
the P1.mkv file generated)
To fix it, double right click the circle of the subtitle item until it
becomes a download triangle.
And type in the correct time.

Save the subtitle as Pi-1-final.idx / sub.

Do the same to other subtitle Pi-02.sup.idx/sub. Save as
Pi-2-final.idx/sub